If they want Ultron to rack up a body count of notable characters, I fear for his version of Rhodey.

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And if Tony is responsible for Ultron's creation it would amp up the emotional stakes to have Ultron kill Rhodey. It could also serve as the catalyst that gets Tony back in action as Iron Man. If Rhodey appears there's a good chance he's a goner.

Of course in the comics when things got really, really bad for Rhodey he was turned into a part cyborg essentially and then a clone body was made for him.....so, hey everything is in play I suppose. Clone body=new actor for next IM film